// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.api.ads.dfa.matchtables;

/**
 * Interface specifying callback methods that DataTransferFileScanner will call when
 * reading in Data Transfer file.
 *
 * @author Moshe Kahan
 */
interface DataTransferFileParser {

  /**
   * Parses the first line of a DT file with the field column names.
   * @param line first line of DT file.
   * @return number of columns in this line. 
   */
  int parseHeader(String line) throws DataTransferFileException;

  /**
   * Parses a line of a DT file with DT field values.
   * @param line a line of a DT file.
   */
  void parse(String line) throws DataTransferFileException;

  /**
   * Clears all header information.  We can now begin parsing a new DT file.
   */
  void clearHeaders();
}
